we just want the trauma to be niche, not unachievable.

code/datums/brain_damage/brain_trauma.dm

@@ -9,7 +9,8 @@
 	var/obj/item/organ/brain/brain //the poor bastard's brain
 	var/gain_text = "<span class='notice'>You feel traumatized.</span>"
 	var/lose_text = "<span class='notice'>You no longer feel traumatized.</span>"
-	var/can_gain = TRUE //can this be gained through random traumas?
+	var/can_gain = TRUE
+	var/random_gain = TRUE //can this be gained through random traumas?
 	var/resilience = TRAUMA_RESILIENCE_BASIC //how hard is this to cure?
 
 /datum/brain_trauma/Destroy()
@@ -23,7 +24,7 @@
 //Called on life ticks
 /datum/brain_trauma/proc/on_life()
 	return
-	
+
 //Called on death
 /datum/brain_trauma/proc/on_death()
 	return

code/modules/mob/living/brain/brain_item.dm

@@ -265,7 +265,7 @@
 	var/list/datum/brain_trauma/possible_traumas = list()
 	for(var/T in subtypesof(brain_trauma_type))
 		var/datum/brain_trauma/BT = T
-		if(can_gain_trauma(BT, resilience))
+		if(can_gain_trauma(BT, resilience) && initial(BT.random_gain))
 			possible_traumas += BT
 
 	if(!LAZYLEN(possible_traumas))